PALS investigations of free volumes thermal expansion of J-PET plastic scintillator synthesized in polystyrene matrix
A. Wieczorek, B. Zgardzi\'nska, B. Jasi\'nska, M. Gorgol, T., Bednarski, P. Bia{\l}as, E. Czerwi\'nski, A. Gajos, D. Kami\'nska, {\L}., Kap{\l}on, A. Kochanowski, G. Korcyl, P. Kowalski, T. Kozik, W. Krzemie\'n,, E. Kubicz, S. Nied\'zwiecki, M. Pa{\l}ka, L. Raczy\'nski, Z. Rudy
TL;DR
This study uses positronium probes to investigate the thermal expansion and structural transitions of a polystyrene-based plastic scintillator across a wide temperature range, revealing multiple phase transitions and hysteresis effects.
Contribution
It introduces a novel application of positronium probing to analyze thermal expansion and phase transitions in J-PET plastic scintillators.
Findings
Identified three structural transitions at 260 K, 283 K, and 370 K.
Observed significant hysteresis in o-Ps intensity with temperature.
Detected time-dependent o-Ps intensity variations at 370 K.
Abstract
The polystyrene dopped with 2,5-diphenyloxazole as a primary fluor and 2-(4-styrylphenyl)benzoxazole as a wavelength shifter, prepared as a plastic scintillator was investigated using positronium probe in wide range of temperatures from 123 to 423 K. Three structural transitions at 260 K, 283 K and 370 K were found in the material. In the o-Ps intensity dependence on temperature, the significant hysteresis is observed. Heated to 370 K, the material exhibits the o-Ps intensity variations in time.
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